WO2006103784A1

WO2006103784A1 - Throttle valve control device and throttle valve control method

Info

Publication number: WO2006103784A1
Application number: PCT/JP2005/006442
Authority: WO
Inventors: Kentaro Jumonji; Shuuichi Nakano
Original assignee: Hitachi, Ltd.
Priority date: 2005-03-25
Filing date: 2005-03-25
Publication date: 2006-10-05
Also published as: EP1867851A4; DE602005010757D1; EP1867851B1; US20090205610A1; EP1867851A1; JPWO2006103784A1

Abstract

A throttle valve control device for controlling an intake flow to an engine making it hard for a driver to hear return spring check sound and capable of detecting the failure of a return spring earlier by checking the return spring while the engine is operating and a throttle valve control method. To reduce the wear of the gears of the throttle valve control device, when a target throttle opening is controllably fully opened while the engine is operating, the control of a throttle valve is stopped. After the control of the throttle valve is stopped, it is checked whether or not a throttle sensor output value is equal to a throttle sensor output value at a throttle machine full open position.

Description

THROTTLE VALVE CONTROL DEVICE AND CONTROL METHOD TECHNICAL FIELD

The present invention relates to a throttle control device for an internal combustion engine and a control method thereof. Background art

As shown in Fig. 1, the operation of a typical diesel engine compresses engine combustion chamber air, injects fuel into the compressed and heated air, and the fuel and air burn and explode. Explosive force is output as rotational power through the crankshaft. The exhaust gas contains toxic substances such as nitrogen oxides (N O X), and nitrogen oxides are reduced by placing a precious metal catalyst in the exhaust pipe. In addition, a part of the exhaust gas after combustion is recirculated to the intake pipe via the EGR valve and added to the intake air. This is achieved by mixing the exhaust gas with the intake air, thereby increasing the peak combustion temperature. Nitrogen oxide NOX in exhaust gas is reduced.

Diesel engines differ from engine output adjustments based on the intake flow rate and fuel injection amount of gasoline engines, and the engine output is controlled by the fuel injection amount. The throttle opening of the throttle control device for diesel engines Is basically controlled at the fully open position where the air flow is maximized. The exhaust gas is recirculated to the intake pipe to control the intake / exhaust gas mixing ratio, and the throttle valve is closed when the engine is stopped. That is, when the engine is operating, the throttle opening frequency of the throttle valve device is the highest in the control fully open position. The configuration of the throttle valve device 8 is shown in FIG. The throttle valve device is connected to the throttle valve 8 0 1, the throttle valve 8 0 2, the motor 8 0 3 that drives the throttle valve 8 0 2, and the motor output is decelerated to transmit power to the throttle valve 8 0 2. Even when the intermediate gear 8 0 4 and the throttle valve device 8 are not controlled, that is, when the drive signal is not supplied to the throttle valve device 8, the throttle valve 8 0 2 is in the fully open position of the machine. A throttle return spring (hereinafter referred to as a return spring) 8 0 5 is arranged, and a throttle sensor 8 0 6 for detecting the throttle opening is arranged. Further, the throttle valve device 8 has a mechanical fully closed stopper 8 0 8 in which the throttle valve 8 0 2 is mechanically in the fully closed position, and the throttle valve 8 0 2 is mechanically opened from the fully open position. A fully open machine stop 8 0 7 to prevent is arranged. ,

FIG. 3 is a sectional view of the throttle valve device. The throttle control is performed between the machine fully closed stop 8 0 8 and the machine fully open stop 8 0 7. As for the position control of the throttle valve, the position between the opening position of the small opening degree from the mechanical fully closing stopper 80 8 and the position of the closing position of the small opening position from the mechanical full opening stopper 8 08 is, for example, It is controlled between the position 0.5 ° open from the closed stop 8 0 8 and the position 0.5 ° closed from the fully open stop 8 0 7. For example, if the throttle valve 8 0 2 is to be position-controlled at the fully closed stop position of the machine, the throttle valve 8 0 3 collides with the fully closed stopper 8 0 8 and causes hunting. This is because it cannot be controlled to the closed stopper position.

In the control fully open position MaxCTP, where the frequency of the control opening is high, the control full open position Eax CTP will be controlled at one point. Certain gears may wear abnormally in gears. In other words, if control is to be performed at the control fully open position MaxCTP—point, the gear rotates forward and reverse across one tooth of the motor gear 8 0 9, or the throttle valve gear 8 10 or the intermediate gear 8 0 4. Only one tooth promotes wear.

As a countermeasure, when controlling to the fully open position Max CTP, there is a method of stopping the throttle control and holding it to the fully open position MaxMTP with the return spring 8 0 5. In other words, if the return spring 8 0 5 is energized in one direction in the fully open position MaxMTP direction of the machine, the gear will not rotate forward and backward across only one tooth of the gear, reducing wear. Is possible.

The diagnosis method for the return spring 805 will be described with reference to FIG. Generally, the diagnosis of the return spring 805 is performed by driving the screw valve in the direction opposite to the direction energized by the return spring 805 and stopping the throttle valve at an arbitrary opening degree. Then, check that the throttle valve is returned to the default opening, that is, urged by the return spring 8 0 5 to the fully open stop 8 0 7 position. The diagnosis is performed when the engine is stopped. This is done when the engine is stopped to prevent the engine output from fluctuating unexpectedly if the above diagnosis is performed while the engine is running.

If the engine is stopped, the throttle valve is driven in the direction not urged by the return spring 8 0 5 and then stopped, so the throttle valve collides with the fully open stopper 8 0 7 and the engine operates. Compared to the sound, there is a problem that the collision sound is noticeable and it becomes harsh. In addition, there is a method of performing a return spring check when the throttle drive is abnormal as disclosed in Japanese Patent Laid-Open No. 4 1 2 4 6 2 5 7. In this case, even if the return spring 8 0 5 is broken, the return spring is not diagnosed unless the throttle drive is abnormal, so it is not possible to detect the return spring failure early. is there.

If detection is not possible at an early stage, the return spring 8 0 5 will break and the throttle valve 8 0 2 will move to the fully closed position M i nMTP due to vibration, etc. while the intake air to the engine is being supplied by the charger. If it operates unexpectedly, the supplied intake air is blocked by the throttle valve 8 0 2, and the supplied air may cause intake leakage from the most fragile part of the intake path. Disclosure of the invention.

One of the typical throttle valve control devices of the present invention is a throttle valve that controls the intake flow rate of an engine, a throttle sensor that detects the opening of the throttle valve, and biases the throttle valve in any one direction. A spring, a throttle stopper that limits the operating range of the throttle valve, a stop means that stops the control drive of the throttle valve when the opening of the throttle valve is greater than or equal to a predetermined value, and a throttle When the control operation of the throttle valve is stopped, the output value determination means for determining whether the output value of the throttle sensor is the output value of the throttle sensor at the throttle stopper, and the output value of the throttle sensor is the throttle value at the throttle stopper. If it is different from the output value of the torque sensor, it is attached in one direction. To and a and determining failure determining means spring is faulty. In addition, a typical throttle valve control method of the present invention includes a throttle bar. The step of stopping the throttle valve control drive when the lube opening is equal to or greater than the predetermined value, and the throttle sensor output value is throttled when the throttle valve control drive is stopped. If the thrust sensor output value at the thrust stopper is different from the throttle sensor output value at the throttle stopper, the spring urging in one direction will fail. And a step of determining that the

According to the present invention, since the return spring failure diagnosis is performed during engine operation, it is difficult to hear the return spring failure diagnosis sound, and it is possible to detect a return spring failure early. it can. Brief Description of Drawings

Fig. 1 is a block diagram of a conventional diesel engine control system.

FIG. 2 is a block diagram of the stall valve device.

FIG. 3 is an operation range diagram of the stall valve device.

Fig. 4 is a timing chart of the conventional spring diagnosis.

FIG. 5 is a schematic diagram of diesel engine control in the present invention. FIG. 6 is a flowchart of the return spring diagnosis process of the first embodiment. FIG. 7 is a flowchart of the return spring diagnosis process of the second embodiment. FIG. 8 is a flowchart of the return spring diagnosis process of the third embodiment. FIG. 9 is a flowchart of the return spring diagnosis process of the fourth embodiment. FIG. 10 is a flowchart of the return spring diagnosis process of the fifth embodiment. FIG. 11 is a flowchart of the return spring diagnosis process of the sixth embodiment. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described based on examples.

First, a system for controlling a diesel engine will be described with reference to FIG. FIG. 5 is a schematic view for controlling the diesel engine in this embodiment. The engine control device 1 for controlling the engine includes an injector drive driver for driving the fuel injector 2, a glow plug drive driver for driving the glow plug 3, and a control for controlling the engine. A motor driver for controlling the microcomputer and the throttle valve device is provided. In addition, various sensor information such as the accelerator position sensor 4 for detecting the accelerator opening, the engine water temperature sensor, and the engine rotation sensor 5 is taken in, and various arithmetic processes are performed by the control microcomputer. Fuel injection time and throttle target opening TTP are calculated. The throttle valve device 8 is controlled based on the throttle target opening TP. In addition, the throttle opening of the throttle valve device for diesel engines is basically controlled at the control fully open position where the air flow rate is maximum, and there is no difference in the intake air flow rate between the control fully open position MaxCTP and the machine fully open position MaxMTP. In this case, whether or not throttle control is performed does not affect the engine output.

(Example 1)

Next, throttle control stop means and return spring failure diagnosis processing for reducing gear wear in Embodiment 1 of the present invention, throttle valve fully open The direction driving process will be described with reference to FIG. (Hereinafter referred to as return spring failure diagnosis 1.) The processing of the first embodiment is repeatedly executed at regular intervals.

First, at step S 1 0 1, it is determined whether or not a return spring failure has occurred, and if it is a return spring failure, the process proceeds to step S 1 0 2 where a failure such as a throttle full-open direction drive process is performed. Perform safe processing. If there is no return spring failure, proceed to step S 1 0 3. In step S 1 0 3, the throttle target opening TT P is calculated based on various information. Next, in step S104, the throttle target opening TTP is checked, and it is determined whether or not the throttle target opening TTP is the control fully open position MaxCTP. If the throttle target opening TP is not the fully open control position MaxCTP, the process proceeds to step S 1 1 2 and the throttle target opening TT P continues throttle control. If the throttle target opening TT P is the control fully open position MaxCTP, the process proceeds to step S 1 0 5 and the time that control continued to the control fully open position MaxCTP Ttimer 1 is the wait time Twait 1 hour or more Determine. If Timer 1 <= Twait 1, go to step S1 1 0 and step S1 1 1, control throttle valve 8 0 2 to full open control position MaxCTP, count up Ttimer 1 and throttle Measure the time during which valve 8 0 2 is being controlled to the fully open position MaxCTP.

When Ttimer 1> Twait 1, the process proceeds to step S 1 0 6, the throttle control is stopped, and the process proceeds to step S 1 0 7. In step S 1 0 7, it is determined whether or not the throttle valve opening ATP is the fully opened position MaxMTP. When the throttle valve opening ATP is at the fully open position MaxMTP, the throttle valve 8 0 2 is driven by the return spring 8 0 5 Return to the fully open position MaxMTP and determine that the return spring 8 0 5 is normal. In this case, fail-safe treatment is not performed. If the throttle valve opening ATP is not the fully open position of the machine MaxMTP, it is determined that the return spring 8 0 0 is out of order, and the process proceeds to steps S 1 0 8 and S 1 0 9. In step S 1 0 8, a return spring failure determination process is performed, and in step S 1 0 9, a file safe process for driving the throttle valve 8 0 2 in the fully open direction is performed.

Thus, when the throttle target opening TTP is the control full open position Max CTP, the control full open position Max CTP hestle opening valve 8 2 is controlled for a predetermined time, and then the throttle control is stopped. This makes it possible to reduce the impact force of the throttle valve 80.2 on the fully opened position MaxMTP compared to when the throttle control is stopped from the control fully closed position MinCTP, for example. In addition, by holding the throttle valve 8 0 2 at the fully open position MaxMTP with the return spring 8 0 5, the amount of gear wear is reduced compared to when holding the throttle valve at the controlled fully open position Max CTP. Can be reduced. Furthermore, if the throttle valve opening ATP is checked during the period in which the throttle control is stopped and the machine fully open position MaxMTP is not reached, the throttle valve 8 0 2 is fully opened due to a return spring failure. It can be determined that the position cannot be held at MaxMTP, and return spring failure can be detected. In other words, even during engine operation, it is possible to perform return spring failure diagnosis together with means to reduce the amount of gear wear, and to detect return spring failure early. Become.

As described above, in the first embodiment, the wear of the intermediate gear 8 0 4, motor gear 8 0 9, and throttle gear 8 10 that drives the throttle valve 80 2 is reduced. In the throttle valve device having the means to stop, the throttle control is stopped, the wear of the gear is reduced, and return spring failure diagnosis is performed during engine operation. It becomes possible to make it hard to hear. In addition, return spring failure diagnosis is performed even when the engine is running, so return spring failure can be detected early. Furthermore, after detecting the return spring failure, the throttle valve 80 2 is driven in the fully open direction to prevent the throttle valve 8 0 2 from moving in the fully closed position of the machine, and the intake path can be prevented from being damaged. It becomes possible.

(Example 2)

Next, return spring failure diagnosis (hereinafter referred to as return spring failure diagnosis 2) in Embodiment 2 of the present invention will be described with reference to FIG. The processing from step S 2 0 1 to step S 2 1 3 in FIG. 7 is the same as the processing from step S 1 0 1 to step S 1 1 3 in FIG. 6 of the first embodiment. _

In step S 2 0 6, the throttle control is stopped, and the process proceeds to step S 2 1 4. In step S 2 1 4, it is determined whether or not Ttimer2 that measures the time after the stop of the throttle control has exceeded the waiting time Twait 2. If Ttimer 2 = Twai 2, go to step S 2 1 5, count up Ttimr 2 and end this return spring failure diagnosis 2. When Ttimer 2> Twait 2, the process proceeds to step S 2 0 7, and the throttle valve opening ATP is checked in the same manner as in the processing from step S 1 0 7 to step S 1 0 9 in the first embodiment. Perform fail-safe processing.

In this way, after a predetermined time has elapsed since the throttle control stopped (Twait 2), the throttle valve opening ATP is determined, and the return spring failure determination is performed. By doing so, it is possible to prevent erroneous detection of a return spring failure.

For example, if the throttle valve opening ATP is checked while the throttle valve 8 0 2 is returning from the control fully closed position M i nCTP to the machine fully open position MaxMTP, the throttle valve opening ATP will always be the machine fully open position. Since it is not MaxMTP, return spring 8 0 2 erroneously detects a return spring failure even though the machine has returned to the fully open position MaxMTP. Twa it 2 is, for example, the time when the throttle valve 8 0 2 stops control and the time is returned from the control fully closed position M i nCTP to the machine fully open position MaxMTP helicopter spring force. Regardless of the position between the control fully closed position M i nCTP and the control fully open position MaxCTP, the return valve force checks the throttle valve opening ATP while returning to the machine fully open position MaxMTP. Therefore, it is possible to prevent erroneous detection of a return spring failure as described above.

As described above, in Example 2, after the throttle control stops, the throttle valve stops the return spring failure diagnosis in advance for the return time from the machine fully closed position MinMTP to the machine fully open position MaxMTP, and the return time After elapse, perform return spring failure diagnosis. In other words, the return spring failure diagnosis is stopped while the throttle valve 8 0 2 is returning to the machine fully open position MaxMTP by stopping the return spring failure diagnosis for the time required for the throttle valve to return to the machine fully open position MaxMTP. Can be prevented from being erroneously detected. .

(Example 3)

Next, return spring failure diagnosis (hereinafter referred to as “return torque failure diagnosis 3”) in Embodiment 3 of the present invention will be explained based on FIG. 1 Explain. The processing from step S 3 0 1 to step S 3 1 3 in FIG. 8 is the same as the processing from step S 1 0 1 to step S 3 1 3 in FIG. 6 of the first embodiment.

In step S 3 06, the throttle control is stopped, and the process proceeds to step S 3 0 7, where it is determined whether or not the throttle valve opening ATP is the fully opened position MaxMTP. If the throttle valve opening ATP is at the fully open position MaxMTP, this return spring failure diagnosis 3 ends. If the throttle valve opening ATP is at the machine fully open position MaxMTP, go to Step S 3 1 4 and the time during which the throttle valve opening ATP is not at the machine fully open position MaxMTP Determine whether or not. When Ttimer 3 = Twait 3, the process proceeds to step S 3 1 5, Ttimer 3 is counted up, and this return spring failure diagnosis 3 ends. If Ttimer 3> Twait 3, the process proceeds to step S 3 0 8 and the throttle valve opening ATP is checked in the same manner as in step S 1 0 7 to step S 1 0 9 in the first embodiment. Executes fail safe processing.

As described above, after the throttle control is stopped, it is determined whether or not the throttle valve opening ATP is at the fully opened position MaxMTP, and the elapsed time Ttimer 3 when the throttle valve opening ATP is not at the fully opened position MaxMTP is determined. When the measured and elapsed time exceeds the waiting time Twait 3, if a return spring failure is detected, it is possible to prevent erroneous detection of a return spring failure equivalent to the second embodiment.

In other words, throttle control is stopped, and the throttle valve 8 0 2 is set to the waiting time Twait 3 for the return time from the control fully closed position MinCTP to the machine fully open position MaxMTP, so that the throttle valve 8 0 2 is in the control fully closed position Return spring failure while returning from MinCTP to fully open position MaxMTP Thus, it is possible to prevent erroneous detection of a return spring failure.

As described above, in Example 3, when the return spring failure diagnosis is performed after the throttle control is stopped and the throttle sensor output value is not in the fully open position of the machine for a certain period of time, it is determined that the return spring has failed. While the throttle valve 8 02 is returning to the fully open position MaxMTP, it is possible to prevent erroneous detection of a return spring failure.

(Example 4)

Next, return spring failure diagnosis (hereinafter referred to as return spring failure diagnosis 4) in Embodiment 4 of the present invention will be described with reference to FIG. The processing from step S 4 0 1 to step S 4 1 3 in FIG. 9 is the same as the processing from step S 1 0 1 to step S 1 1 3 in FIG. 6 of the first embodiment.

Time during which control was continued to the fully open position in step S 4 0 5

It is determined whether or not T timer 1 is equal to or greater than T wai t 1 hour. If T timer 1> T wait 1, the process proceeds to step S 4 14. In step S 4 1 4, it is determined from the throttle valve opening ATP immediately before the stop of the throttle control whether the throttle control is stopped and the throttle return time Twait to the fully open position of the machine is calculated. If the throttle return time Twait 4 has not been calculated, the process proceeds to step S 4 1 5 to calculate the throttle return time Twait 4 from the throttle valve opening ATP immediately before the throttle control stop to the fully opened position MaxMTP. To do. If the throttle return time Twait 4 has been calculated, the process proceeds to step S 4 06. Therefore, when the throttle control is stopped, the throttle return time Twai t 4 is calculated only once.

In step S 4 0 6, stop the throttle control and Move to S 4 1 6. In step S 4 1 6, it is determined whether or not the elapsed time Ttimer 4 after the stop of the throttle control has exceeded the throttle return time Twait 4. If Ttimer 4 = Twait 4, go to step S 4 1 7 and count up elapsed time Ttimer 4. If Ttimer 4> Twait 4, the process proceeds to step S 4 0 7 and the throttle valve opening ATP is checked in the same manner as the process from step S 1 0 7 to step S 1 0 9 in the first embodiment. And perform the face-safe treatment.

As described above, the waiting time Twait 4 from when the throttle control is stopped until the throttle valve opening ATP is determined to be at the fully opened position MaxMTP is set as the throttle valve opening immediately before the throttle control is stopped. By calculating from the ATP, it becomes possible to determine the return spring failure early compared to the return spring failure diagnosis of the first to third embodiments.

When comparing the case where the throttle valve opening ATP is near the control fully open position and the case where the throttle valve opening ATP is close to the control fully closed position, the waiting time is greater when the throttle opening is near the control fully open position. Compared to the case where the waiting time in Example 2 is set to the constant return time Twait 2 from the control fully closed position to the fully opened position of the machine, return spring failure can be detected earlier. It becomes.

As described above, in Example 4, the estimated return time for the throttle valve 8 0 2 to return to the fully opened position MaxMTP is calculated based on the output value of the throttle sensor immediately before the throttle control stop. If the throttle sensor output value is not in the fully closed position after the estimated return time has elapsed, it is determined that there is a reverse spring failure, and the failure is detected at the failure detection time for each throttle valve opening just before the throttle control stop. Early detection it can.

(Example 5)

Next, a return spring diagnosis (hereinafter referred to as return spring diagnosis 5) in Embodiment 5 of the present invention will be described with reference to FIG. The processing from step S 5 0 1 to step 5 1 3 in FIG. 10 is the same as the processing from step S 1 0 1 to step S 1 1 3 in FIG. 6 of the first embodiment.

Time during which control was continued to the fully open position in step S 5 0 5

It is determined whether or not Ttimer l is equal to or greater than Twai t 1 hour. If Ttimer l> Twait 1, the process proceeds to step S 5 14. In step S 5 14, the current throttle valve opening A T P is stored in the throttle valve opening buffer ATP_Buffer, and the process proceeds to step S 5 0 6. In step S 5 0 6, the throttle control is stopped, and the process proceeds to step S 5 1 5. In step S 5 15, the current throttle valve opening ATP is compared with the throttle valve opening buffer ATP—Buffer just before the throttle control stop. In the case of AT P <= ATP— Buffer, that is, when operating in the fully closed direction, it is determined that the return spring has failed, and the process proceeds to step S 5 0 8 to perform the return spring failure determination process and fail-safe process. Go. If ATP> ATP—Buf fer, that is, if the actuator is operating in the throttle full open direction, the return spring is biased in the throttle full open direction, and it is determined that the return spring is normal. Step S 5 0 7 Migrate to. From step S5007 to step S5009, the throttle valve opening ATP is checked in the same way as the processing from step S1007 to step S1009 in the first embodiment, and the fail safe process is performed. And so on.

In this way, the throttle valve opening buffer just before the throttle control stops When the throttle valve opening buffer ATP—Buffer is operating in the throttle fully closed direction by comparing the ATP—Buffer with the throttle valve opening ATP after the throttle control stopped. In other words, when operating in the direction opposite to the direction urged by the return spring 8 0 5, it becomes possible to detect early that the return spring has failed.

As described above, in Example 5, the throttle sensor output value operates in the direction opposite to the direction biased by the return spring 8 0 5 compared to the throttle sensor output value immediately before the throttle control stop. In this case, it can be determined that the return spring 8 0 5 has failed, and a return spring failure can be detected early.

(Example 6)

Next, return spring failure diagnosis (hereinafter referred to as return spring failure diagnosis 6) in Embodiment 6 of the present invention will be described with reference to FIG. 1.1. The processing from step S 6 0 1 to step S 6 1 3 in FIG. 11 is the same as the processing from step S 1 0 1 to step S 1 1 3 in FIG. 6 of the first embodiment.

In step S 6 0 1, it is determined whether or not a return spring failure has been confirmed. If return spring failure has not been confirmed, proceed to step S600. If a return spring failure has been confirmed, the process proceeds to step S 6 14 and after the return spring failure is confirmed, that is, the elapsed time from the start of fail-safe processing. Determine whether.

When Ttimer 6 <= Twait 6, the process proceeds to step S 6 1 6, and the drive amount for driving the throttle valve 8 0 2 in the fully open direction is set to a fixed value 1. Ttimer 6 6

> In the case of Twa i t 6, the process proceeds to step S 6 1 5 where the drive amount is set to a fixed value 2 and the fail safe operation is continued.

For example, the fixed value 1 is a value sufficient to reliably drive the throttle control fully closed position to the throttle machine fully open position, and the fixed value 2 holds the throttle valve 8 0 2 in the fully open position of the machine. Use a sufficient value. That is, the relationship between the fixed value 1 and the fixed value 2 is fixed value 1> fixed value 2. The throttle valve 8 0 2 is generally controlled by the motor 8 0 3, and the fixed value 1 and the fixed value 2 are input to the motor driver that controls the motor 8 0 3, and the throttle valve Drive. When the fixed value 1 and fixed value 2 are input to the motor driver, the motor driver generates more heat than the fixed value 1. In other words, if the fixed value 1 is continuously input, the motor driver generates more heat. By setting the drive amount to a fixed value 2 after the elapse of the waiting time Twa i t 6, it is possible to reduce the heat generation of the motor driver.

Also, in Example 1 to Example 6, when the throttle target opening TTP is the control fully open position MaxCTP, the throttle control drive was stopped, but the throttle target opening TTP that stopped the throttle control was stopped. The control fully open position may not be the MaxMTP. Further, if the throttle valve opening ATP is different from the machine fully open position MaxMTP, it is determined that the return spring has failed, but the machine fully open position MaxMTP to be determined as a return spring failure is different, for example, the closing direction from the machine fully open position MaxMTP. The value may be shifted by 1 °.

In Example 6, when a return spring failure is confirmed in Examples 1 to 5, the throttle valve 8 05 is driven at a fixed value in the fully opened direction of the machine, but the fixed value is output. After a predetermined time has elapsed, the motor is driven by decreasing the fixed value. To reduce the heat generated by the motor driver.

Claims

The scope of the claims

1. A throttle valve that controls the intake air flow of the engine,

A throttle sensor that detects the opening of the throttle valve, a spring that urges the throttle valve in one arbitrary direction, a throttle stopper that limits the operating range of the throttle valve, and the throttle valve Stop means for stopping control drive of the throttle valve when the opening degree is equal to or greater than a predetermined value or less than the predetermined value, and the stop sensor when the control drive of the throttle valve is stopped. Output value determining means for determining whether the output value of the throttle sensor is an output value of the throttle sensor in the throttle stopper;

And a failure determination means for determining that the spring biased in the one direction has failed when the output value of the throttle sensor is different from the output value of the throttle sensor in the throttle stopper. A throttle valve control device.

2. The throttle valve control device according to claim 1,

The throttle valve control device, wherein the failure determination means determines that the spring has failed after a predetermined time has elapsed since the control drive of the throttle valve stopped.

3. The throttle valve control device according to claim 1,

The throttle valve control device further includes measuring means for measuring a time when the output value of the throttle sensor is not the output value of the throttle sensor in the throttle stopper,

The failure determining means determines that the spring biased in the one direction has failed when a time that is not the output value of the throttle sensor in the throttle stopper has elapsed for a predetermined time. Shield valve device.

4. In the throttle valve control device according to claim 1,

The throttle valve control device further includes calculation means for calculating a return time to the throttle stock based on an output value of the throttle sensor immediately before stopping the control of the throttle valve,

The output value determining means determines whether or not the output value of the throttle sensor is the output value of the throttle sensor at the throttle stopper after the return time has elapsed since the stop of the control of the throttle valve. This is a throttle valve control device.

5. In the throttle valve control device according to claim 1,

The throttle valve control device further includes a storage means for storing the output value of the throttle sensor immediately before stopping the control of the throttle valve;

Comparing means for comparing the stored output value of the throttle sensor with the output value of the throttle sensor after the control of the throttle valve is stopped,

In the failure determination means, the output value of the throttle sensor after the stop of the control of the throttle valve becomes an output value in the reverse direction urged by the spring with reference to the stored throttle sensor output value. In this case, the throttle valve control device determines that the spring urging in one direction is broken.

6-The throttle valve control device according to claim 1,

The throttle valve control device further drives the throttle valve in the same direction as the direction biased by the spring when it is determined that the spring biased in the one direction is broken. Driving means A throttle valve control device comprising:

7. The throttle valve control device according to claim 6,

The throttle valve control device according to claim 1, wherein a drive amount for driving the throttle valve in the same direction as the direction biased by the spring is a fixed value.

8. The throttle valve control device according to claim 7,

A throttle valve control device characterized in that after a predetermined time has elapsed since the fixed value, a fixed value different from the fixed value is set.

9. Stopping the throttle valve control drive when the throttle valve opening is equal to or greater than a predetermined value or less than the predetermined value; and when stopping the control drive of the throttle valve, Determining whether the output value of the throttle sensor is the output value of a throttle sensor in the throttle stopper;

And a step for determining that the spring biased in the one direction is out of order when the output value of the throttle sensor is different from the output value of the throttle sensor in the throttle stopper. Tor valve control method.

1 0. In the method of controlling a steam valve according to claim 9,

The throttle valve control method is characterized in that the step of determining that there is a failure is executed after a predetermined time has elapsed since the control drive of the throttle valve stopped.

1 1. In the throttle valve control method according to claim 9,

The throttle valve control method further includes a step of calculating a return time to the throttle and the shuttle stopper based on an output value of the throttle sensor immediately before stopping the control of the throttle valve. The step of determining whether or not the output value of the throttle sensor is the output value of the throttle sensor in the throttle stopper is after the return time has elapsed since the stop of control of the throttle valve. A throttle valve control method that is executed.

1 2. In the throttle valve control method according to claim 9,

The throttle valve control method further includes a step of storing an output value of the throttle sensor immediately before stopping the control of the throttle valve;

A step of comparing the stored output value of the throttle sensor with the output value of the throttle sensor after the stop of the control of the throttle valve;

In the step of determining that the spring has failed, the output value of the throttle sensor after the throttle valve control is stopped is urged by the spring with the stored throttle sensor output value as a reference. A throttle valve control method, wherein when the output value is in the reverse direction, it is determined that the spring energized in the one direction is broken.